Hangtime wants you to check out its check-out service

You want to meet friends at an event, but aren't sure where they will be in the next hour or so. The typical drill: it's nearly impossible to coordinate your moves without a long trail of texts.

While Foursquare is the standard for letting people know where you are at that moment, a new app called Hangtime is designed to help coordinate meetups at crazed gatherings like SXSW.

Banjo and Highlight also offer apps that excel at catching the serendipity of events like SXSW.

Hangtime, started by former Microsoft executive Karl Jacob, launched Thursday for the interactive portion of the show. By Sunday, it was tracking 2,200 events here, like a predictive Timeline.

Jacob frames Hangtime as the only app that "maps a friend's social future." Put simply, "we're the first company to focus on the social future (of) helping people discover new opportunities to hang out," says Jacob, who is company CEO.

The visual app depicts where people are -- and their future plans -- with simple, single-finger swipes of the screen.

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